Preheat oven to 150°C, fan forced. Line a baking tray with non-stick baking paper. Whip the egg white in a medium sized bowl until starts to foam. Combine the sugar spices and salt and mix well in another bowl. Add the macadamias to the egg white and coat evenly, remove the macadamias and add to the spice mix and coat evenly.
Place the coated macadamias onto the prepared tray in one layer and separate them individually. Bake for 20-25 minutes or until the coating mixture has hardened.
Allow to cool to room temperature on the tray.
To serve sprinkle with icing sugar.